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We do our best to ensure that the data we release is as complete, accurate and useful as possible. We cannot always determine which specific residential building products are made at a given manufacturing facility, and manufacturers may shift production of products or product lines between different facility locations over time. Data provided on products made by U.S. manufacturers at their facilities should be verified by the manufacturer to meet any domestic or local content standards. Union status is difficult to determine. Facilities with the “Union workers” label have at least two F-7 Notice of Bargaining forms (at least one from 2015 or later) filed with the Federal Mediation and Conciliation Service, which indicates that workers at the facility are likely to be represented by a union.